During the tutorial, he dismisses the player character's attempts at making idle conversation, and proceeds to teach them how Melee and Rangedcombat work. He tasks the player with slaying a giant rat in close combat. Afterwards, he instructs the player to kill a second rat from outside of the enclosure using ranged attacks, a strategy colloquially known as safespotting.

When encountered after the tutorial, Vannaka acts as a mid-level Slayer master. He is found due east of the Wilderness entrance within the Edgeville Dungeon, and is marked by a slayer master icon on the minimap. Players with Combat level 40 or higher may receive slayer assignments from him.

Vannaka appears to be wearing a Steel platebody without a left pauldron or chestbody, Steel platelegs, a pair of grey boots, a grey headband, grey gloves and a unidentified white necklace. He, along with the Hero, Mazchna and Oziach are the few NPC's to possess unobtainable different coloured armour.